Extremely Rare Natural Rough Alexandrite Crystals Lot 6.25 Gram A rare and highly collectible Natural Alexandrite rough lot from Russia, total weight 6.25 carats. Russian Alexandrite is considered one of the finest and most valuable in the world due to its strong and dramatic color change. Gemstone: Natural Alexandrite (Rough) Total Weight: 6.25 gm Origin: Russia Shape: Natural rough crystal form (uncut & untreated) Color Change: Green / bluish-green in daylight to reddish / purplish under warm light Clarity: Natural inclusions present (as expected in rough stones) Treatment: No treatment declared Alexandrite was first discovered in Russia and remains one of the rarest gemstones globally. High-quality Russian Alexandrite is especially sought after by collectors and investors because of its strong color shift and historical importance.